What is the average power production of a person who burns 10 500 kJ per day?...
36) (a) What is the average useful power output of a person who does 6.00 x 10^6 J of useful work in 8.00 h? (b) Working at this rate, how long will it take this person to lift 2000 kg of bricks 1.50 m to a platform? (Work done to lift his body can be omitted because it is not considered useful output here.)
A brisk walk at 4 miles per hour burns an average of 280 calories per hour. If the standard deviation of the distribution is 5 calories, find the probability that a person who walks 1 hour at the rate of 4 miles per hour will burn the given number of calories. Assume the random variable is normally distributed. Refer to the table of values (Area Under the Standard Normal Distribution ) as needed. If necessary, round intermediate calculations to the nearest...
Table 2.1: Estimated average power used per person as a function of the stage of human development (worldwide) or as a function of year (for the United States, 1850-2000). The power values are calculated from the primary energy use. society power consumption (W) hunter 100 use of fire 200 domestication of animals 500 Renaissance 1160 1850 4880 1900 5340 1950 7300 1960 8180 1970 11,000 1980 1990 11,000 2000 11,730 Based on data from G.J. Aubrecht II, Energy: Physical, Environmental...
1. Let’s say that an average person consumes about 2000 calories per day over their entire lifetime. A calorie (Cal) is a unit of energy and one Cal equals 4186 ? (Joules). For someone who lives to a ripe age of 100 years, how much energy, in J will they require? What is their average power output in ?/? = ????? (abbreviated ?)? b) Given the total energy a person requires that you calculated above, use Einstein’s equation to determine...
3. An average active person consumes about 2500 Cal (1 Cal =1000 cal) per day. (a) What is this in joules? (b) What is this in kilowatt-hours? (c) If your power company charges about 30 ¢ per kilowatt-hour, how much would your energy cost per day if you bought it from the power company? Just for fun… Do you think you could you feed yourself (adequately) on this much money per day? show work!!
Smoothies Cell phones Martha 15 per day 3 per day Kelly 10 per day 1 per day This table shows the how many smoothies or cell phones Martha and Kelly can each produce if they put all of their respective resources into producing that good alone. Use this information to answer the following questions: 1. Who has an absolute advantage in the production of smoothies? 2. Who has an absolute advantage in the production of cell phones? 3. What is...
An average person can produce considerable power output for short periods of time. However, over an entire 8-hour workday, a person might be able to average 1/10 hp output of physical power. If energy is valued at $0.12/kWh (about the average cost of electricity from a public utility), what is the monetary value of a person's physical work per day?
39. (4 pts) A 500-g mass drops from a height of 10.0 meters. What is its speed just before it hits the ground? 40. (4 pts) A flight attendant pulls a wheeled suitcase, applying a 66-N force at a 35° angle to the horizontal. How much work does she do in pulling the suitcase 45 m? 41. (4 pts) A 1525-kg car drives up a mountain road a vertical rise of 1301 m from the base elevation in 30. min...
8. What is the power output in kgm/min for a70 kg person and a55 kg personboth walking at 4.5 miles/hr at 12% grade? Be sure to convert mph to m/min, and don't forget to express % grade as a decimal. If one wants to cycle at a work rate of 1470 kgm/min and had 4.5 kg resistance on the cycle: 1) What would the rpm be? -(RPMX4.5 K)m) 14 TORam =akgm/rev(RPM) a7kolrer a rer 140kgm Min w= 1470K9mlmin RPM =...
Suppose that the average person watches 6.25 hours of television per day with a standard deviation of 2.75 hours. Assuming television viewing is normally distributed, what percentage of people watch over 10 hours of television per day?